Suppose that 75 is the threshold below which a student must retake the examination. Let's find out the list of students with at least one score below 75, that is, those who didn't succeed. Then, let's create one file per student telling him/her about this.
If you did the previous sections successfully, you should know that you already have half the work done! The
prepare_data.ktr transformation builds the list of students. If not, before proceeding, please go back and create that transformation; you will need it now.